[Solved] Sum of range in array

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Remove the first line of your function sumOfRange() var numbers = [1,-1,1,-1,1] because you are re-initializing the value of numbers, you need to use to array that is passed to the function when it is called.

function sumOfRange(numbers) {
    var sum = 0;
    for (var i = 0; i < numbers.length; i++) {
        sum += numbers[i];
    }
    return sum;
}
console.log(sumOfRange([1,-1,1,-1,1]));
console.log(sumOfRange([1,2,3,4,5]));
console.log(sumOfRange([-4,-5,-10,0]));

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solved Sum of range in array